Hack session 2 was focused on creating the armature for the North Paw kits. Rachel and Eric spent the beginning of it designing and creating prototypes for the mass produced armature, while Skory worked on the belt wiring harness prototype, and David wrote up hack notes for the evening.

Hack session 2 was focused on creating the armature for the North Paw kits. Rachel and Eric spent the beginning of it designing and creating prototypes for the mass produced armature, while Skory worked on the belt wiring harness prototype, and David wrote up hack notes for the evening.

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Eric/Rachel: We tried one with the zipper completely flat, but that didn't give us enough space inside, and made the surface space of the velcro on the outside too small. The design we went with has the zipper folded so that the zipper is on the bend, or the top. Prototyping took an hour and a half.

Eric/Rachel: We tried one with the zipper completely flat, but that didn't give us enough space inside, and made the surface space of the velcro on the outside too small. The design we went with has the zipper folded so that the zipper is on the bend, or the top. Prototyping took an hour and a half.

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We then started to work on mass producing the armatures (while David worked on the hack notes still, and then the website, as well as helping to cut the Veltex display loop). It took 10 minutes to cut the lining fabric, 15 minutes to cut the fashion fabric, and 20 minutes for the foam inserts. Rachel was sewing zippers to the linging for 25 minutes, worked another 30 for the velcro strips to be sewn to the fashion fabric, 20 minutes to attach the zippers to the fashion fabric, and sewed the lining to the fashion fabric in an hour.

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We then started to work on mass producing the armatures (while David worked on the hack notes still, and then the website, as well as helping to cut the Veltex display loop).

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Armature process (Rachel did the sewing while Skory, Eric, and David did cutting, trimming, and arranging):

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# cut 30 pc of display loop, at 11" x 1-1/4" (15 min)

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# cut 30 pc of lining, at 11" x 1-1/2" (10 min)

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# stitch lining to zipper, zipper upside-down with lining underneath so the feed dogs ease the stretchy lining against the non-stretchy zipper. i used a little bit of zigzag for the hell of it (25 min)

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# cut 30 pc of the hook side of 1" velcro, 3" long (15 min?)

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# stitch velcro to one end of the display loop in an X pattern, such that the velcro hooks face down (30 min)

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# stitch the display loop/velcro assemblies to the other side of the zippers, with the velcro towards the end of the zipper where the pull is when closed (this end should go on top if the armature must wrap the ankle at all). zigzag again (20 min)

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# serge the non-zipper edge by folding the armature in half down the zipper (20 min)

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# serge the non-velcro end of the armature (10 min)

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# zigzag the velcro end of the armature (10 min)

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# stuff the motor support inside the completed armatures

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We started at about 10:45 and finished at about 1:30 (numbers don't add up b/c some of the tasks were done in parallel).

Eric brought Sensebridge/North Paw blurbs for the Sensebridge website, they were edited, it was decided that Skory would spend more time later editing them, as well as writing a blurb about Noisebridge.

We first talked about Eric's echolocation kit idea, and how it might work. Eric explained the different approaches that are used to shift sound from the inaudible spectrum to the audible spectrum. The first, digital division, takes an 80khz range of inaudible frequencies and compacts that into an 8khz band of audible frequencies. This results is a loss of audio features, such as amplitude, and is best compared to the ticking of a Geiger counter. Another approach was, heterodine, or to shift one band of 8khz from being inaudible to audible at a time, which works for a certain expected noise but can often result in other inaudible sounds being missed. There are several computationally complex methods which can transform the major sounds of an 80khz band to a 8khz band, but they aren't commonly available.

We also talked about what data bat/human brains need to be able to echolocate. When done naturally, the brain knows it's going to create the sound, and has the physical feeling of creating the sound instantaneously, but we might be able to get by with only the sound and the echo of the sound. This means there are several different approaches, and we need to choose one and do it. The approaches are: emit an inaudible sound and transfer it to audible both at the moment of release and the moment of return; emit an audible sound; emit an inaudible sound and give a somatosensory stimulus simultaneously, and transfer the inaudible sound's echo into audible sound; emit an inaudible sound transferred to an audible sound with a simultaneous somatosensory stimulus, and then transfer the inaudible sound's echo to an audible sound; or to emit an inaudible sound and provide a simultaneous somatosensory stimulus, and then provide a somatosensory stimulus upon the return of the inaudible sound's echo.

We also talked about a monocle that mapped invisible light spectra to visible spectra as false color images, and what effects on the brain that might have. The big question here is how your brain would interpret seeing compositions of true color in one eye and false color in the other. Would it create new colors, map them to existing colors, or just see them as the color they appear to be in each eye?

Hack session 2 was focused on creating the armature for the North Paw kits. Rachel and Eric spent the beginning of it designing and creating prototypes for the mass produced armature, while Skory worked on the belt wiring harness prototype, and David wrote up hack notes for the evening.

Skory: I wired up all the pager motors except the one that broke. My code also isn't working right yet, although that may be that the crimp for the ribbon cable broke and might not be getting an electrical connection.

Eric/Rachel: We tried one with the zipper completely flat, but that didn't give us enough space inside, and made the surface space of the velcro on the outside too small. The design we went with has the zipper folded so that the zipper is on the bend, or the top. Prototyping took an hour and a half.

We then started to work on mass producing the armatures (while David worked on the hack notes still, and then the website, as well as helping to cut the Veltex display loop).

Armature process (Rachel did the sewing while Skory, Eric, and David did cutting, trimming, and arranging):

cut 30 pc of display loop, at 11" x 1-1/4" (15 min)

cut 30 pc of lining, at 11" x 1-1/2" (10 min)

stitch lining to zipper, zipper upside-down with lining underneath so the feed dogs ease the stretchy lining against the non-stretchy zipper. i used a little bit of zigzag for the hell of it (25 min)

cut 30 pc of the hook side of 1" velcro, 3" long (15 min?)

stitch velcro to one end of the display loop in an X pattern, such that the velcro hooks face down (30 min)

stitch the display loop/velcro assemblies to the other side of the zippers, with the velcro towards the end of the zipper where the pull is when closed (this end should go on top if the armature must wrap the ankle at all). zigzag again (20 min)

serge the non-zipper edge by folding the armature in half down the zipper (20 min)

serge the non-velcro end of the armature (10 min)

zigzag the velcro end of the armature (10 min)

stuff the motor support inside the completed armatures

We started at about 10:45 and finished at about 1:30 (numbers don't add up b/c some of the tasks were done in parallel).